<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <style>
    /* .father {
      overflow: hidden;
    } */

    * {
      margin: 0px;
      padding: 0px;
    }

    .float {
      height: 200px;
      width: 100px;
      background-color: aqua;
      float: left;
    }

    .bfc {
      height: 150px;
      width: 150px;
      background-color: antiquewhite;
      overflow: hidden;
    }

    .position {
      height: 50px;
      width: 50px;
      background-color: aquamarine;
      position: relative;
      top: 110px;
      left: 10px;
    }

    .son {
      height: 25px;
      width: 25px;
      background-color: bisque;
      position: absolute;
      margin: 10px 10px;
    }
  </style>
</head>

<body>
  <div class="father">
    <div class="float"></div>
  </div>
  <div class="bfc"></div>
  <div class="position">
    <div class="son"></div>
  </div>
</body>

</html>